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HERFINDAHL INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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PERFECTLY ELASTIC

An elasticity alternative in which infinitesimally small changes in one variable (usually price) cause infinitely large changes in another variable (usually quantity). Quantity is infinitely responsive to price. Any change in price, no matter how small, triggers an infinite change in quantity. This characterization of elasticity is most important for the price elasticity of demand and the price elasticity of supply. Perfectly elastic is one of five elasticity alternatives. The other four are perfectly inelastic, relatively elastic, relatively inelastic, and unit elastic.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for poorly written technical manuals.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Carpe diem! Rejoice while you are alive; enjoy the day; live life to the fullest; make the most of what you have. It is later than you think."

-- Horace, Ancient Roman poet

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